# Define here the models for your spider middleware
#
# See documentation in:
# https://docs.scrapy.org/en/latest/topics/spider-middleware.html
import random

from scrapy import signals

# useful for handling different item types with a single interface
from itemadapter import is_item, ItemAdapter
from fake_useragent import UserAgent
from scrapy.http import HtmlResponse


class DianpingSpiderMiddleware:
    # Not all methods need to be defined. If a method is not defined,
    # scrapy acts as if the spider middleware does not modify the
    # passed objects.

    @classmethod
    def from_crawler(cls, crawler):
        # This method is used by Scrapy to create your spiders.
        s = cls()
        crawler.signals.connect(s.spider_opened, signal=signals.spider_opened)
        return s

    def process_spider_input(self, response, spider):
        # Called for each response that goes through the spider
        # middleware and into the spider.

        # Should return None or raise an exception.
        return None

    def process_spider_output(self, response, result, spider):
        # Called with the results returned from the Spider, after
        # it has processed the response.

        # Must return an iterable of Request, or item objects.
        for i in result:
            yield i

    def process_spider_exception(self, response, exception, spider):
        # Called when a spider or process_spider_input() method
        # (from other spider middleware) raises an exception.

        # Should return either None or an iterable of Request or item objects.
        pass

    def process_start_requests(self, start_requests, spider):
        # Called with the start requests of the spider, and works
        # similarly to the process_spider_output() method, except
        # that it doesn’t have a response associated.

        # Must return only requests (not items).
        for r in start_requests:
            yield r

    def spider_opened(self, spider):
        spider.logger.info('Spider opened: %s' % spider.name)


class DianpingDownloaderMiddleware:
    # Not all methods need to be defined. If a method is not defined,
    # scrapy acts as if the downloader middleware does not modify the
    # passed objects.

    @classmethod
    def from_crawler(cls, crawler):
        # This method is used by Scrapy to create your spiders.
        s = cls()
        crawler.signals.connect(s.spider_opened, signal=signals.spider_opened)
        return s

    def process_request(self, request, spider):
        # Called for each request that goes through the downloader
        # middleware.

        # Must either:
        # - return None: continue processing this request
        # - or return a Response object
        # - or return a Request object
        # - or raise IgnoreRequest: process_exception() methods of
        #   installed downloader middleware will be called
        return None

    def process_response(self, request, response, spider):
        # Called with the response returned from the downloader.

        # Must either;
        # - return a Response object
        # - return a Request object
        # - or raise IgnoreRequest
        return response

    def process_exception(self, request, exception, spider):
        # Called when a download handler or a process_request()
        # (from other downloader middleware) raises an exception.

        # Must either:
        # - return None: continue processing this exception
        # - return a Response object: stops process_exception() chain
        # - return a Request object: stops process_exception() chain
        pass

    def spider_opened(self, spider):
        spider.logger.info('Spider opened: %s' % spider.name)


# def get_ua():
#     first_num = random.randint(60, 73)
#     third_num = random.randint(0, 3200)
#     fourth_num = random.randint(0, 140)
#     os_type = [
#         '(Windows NT 6.1; WOW64)', '(Windows NT 10.0; WOW64)', '(X11; Linux x86_64)',
#         '(Macintosh; Intel Mac OS X 10_13_6)'
#     ]
#     chrome_version = 'Chrome/{}.0.{}.{}'.format(first_num, third_num, fourth_num)
#
#     ua = ' '.join(['Mozilla/5.0', random.choice(os_type), 'AppleWebKit/537.36',
#                    '(KHTML, like Gecko)', chrome_version, 'Safari/537.36']
#                   )
#     return ua

class SeleniumMiddleware(object):
    def process_request(self, request, spider):
        spider.driver.get(request.url)
        return HtmlResponse(url=spider.driver.current_url, body=spider.driver.page_source, encoding='utf8', request=request)
    # def process_response(self, request, response, spider):
    #     if request.url not in #spider.plate_page:
    #         return response


class UserAgentMiddleware(object):
    def process_request(self, request, spider):
        ua = UserAgent()  # 随机生成user-agent
        # request.headers['User-Agent'] = ua.random
        request.headers['User-Agent'] = "Mozilla/5.0 (iPhone; CPU iPhone OS 13_2_3 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.0.3 Mobile/15E148 Safari/604.1"


class ProxyMiddleware(object):
    def process_request(self, request, spider):
        self.proxy = [
            "http://102.134.181.118:9999",
            "http://195.78.93.28:3128",
            "http://95.79.36.55:44861",
            "http://193.149.225.204:80",
            "http://213.6.199.94:49044",
            "http://113.120.34.69:9999",
            "http://202.7.53.128:49647",
            "http://117.141.155.244:53281",
            "http://119.2.54.204:44495",
            "http://176.12.125.241:8080",
            "http://14.207.68.2:8080",
            "http://103.28.37.131:3128",
            "http://103.86.106.17:999",
            "http://89.237.36.193:37647",
            "http://103.204.220.18:83",
            "http://113.121.241.131:8888",
            "http://120.83.110.18:9999",
            "http://190.89.40.5:999",
            "http://37.60.18.242:3128",
            "https://114.55.95.112:8999"
        ]

        request.meta['http_proxy'] = self.proxy[random.randint(0, len(self.proxy)) - 1]
        # proxy = "https://205.185.123.217:1080"
        # request.meta['http_proxy'] = proxy

    # def process_response(self, request, response, spider):
    #     # 对返回的response处理
    #     # 如果返回的response状态不是200，重新生成当前request对象
    #     if response.status != 200:
    #         self.proxy.remove(request.meta['proxy'])
    #         proxy = self.proxy[random.randint(0, len(self.proxy))-1]
    #         print("this is response ip:" + proxy)
    #         # 对当前reque加上代理
    #         request.meta['proxy'] = proxy
    #         return request
